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A Flagellum is a long, tail-like organelle in a cell that allows a cell to move around. It is made up of microtubules and surrounded by a plasma membrane.  

A Flagellum is a long, tail-like organelle in a [[cell]] that allows a cell to move around. It is made up of microtubules and surrounded by a plasma membrane.  

In single-cell organisms flagella move like a whip to provide propulsion to the cell. As part of a larger organism, their function is often to move fluids along mucous membranes.

In single-cell organisms flagella move like a whip to provide propulsion to the cell. As part of a larger organism, their function is often to move fluids along mucous membranes. When they perform this function, they are called [[cilia]].

There are three types of flagella: [eukaryote|eukaryotic], [archaeal] and [bacteria|bacterial].  

There are three types of flagella: [[eukaryote|eukaryotic]], [[archaeal]] and [[bacteria|bacterial]].  

The internal structure of eukaryotic flagella is made up of nine microtubule doublets linked by proteins, which form a cylinder around a central pair of microtubules. There are usually only one or two flagella on a eukaryotic cell, and they move in a lashing motion like a whip. One example of this is the [sperm] cell.

The internal structure of eukaryotic flagella is made up of nine microtubule doublets linked by proteins, which form a cylinder around a central pair of microtubules. There are usually only one or two flagella on a eukaryotic cell, and they move in a lashing motion like a whip. One example of this is the [sperm] cell.

Bacterial flagella have threads in a helix pattern, that rotate rather like a screw to move the organism.

Bacterial flagella have threads in a helix pattern, that rotate rather like a screw to move the organism.

Archaeal flagella appear similar to bacterial flagella, but are different in many details and considered to be an example of [convergent evolution].

Archaeal flagella appear similar to bacterial flagella, but are different in many details and considered by biologists to be an example of [[convergent evolution]].

==The flagellum and the argument for Intelligent Design==

==The flagellum and the argument for Intelligent Design==